Math
Number Patterns
Logic
Riddles
Riddles #2
100

A number, where if multiplied by 3, subtracted by 7, then divided by 2, equals 10.

What is 9?

100

The missing numbers in the pattern: 3, 6, 9, 12, 15, __, __

What is 18 & 21?

100

Five people were eating apples. A finished before B, but behind C. D finished before E, but behind B. What was the final order?

What is CABDE?

100

What has a head and a tail, but no body?

What is a coin?

100

David's parents have three sons: Snap, Crackle, and what's the name of the third son?

What is David?

200

A robot starts at (3, -2). It moves 4 units east, 3 units north, 7 units west, and 1 unit south. What is the distance from its new position to the origin (0, 0)?

What is 0 units?
200

The missing numbers in the pattern: 2, 6, 12, 20, 30, __, __

What is 42 & 56?

200

A class of students is lined up in a single straight row. One student is the 4th person from the front of the line and also the 4th person from the back of the line. How many students are in the line?

What is 7?

200

What gets wetter and wetter the more it dries?

What is a towel?

200

What is always in front of you but can’t be seen?

What is the future?

300

A circular pizza has a radius of 10cm. You double its radius. Name the factor that the circumference increases by.

What is 2?

300

The missing numbers in the pattern: 3, 7, 15, 31, 63, __, __

What is 127 & 255?

300

Two friends, Hans and Marta, play games of tennis against each other. They bet $1 on each game they played. In the end, Hans won three bets. Marta won $5. How many games did they play?

What is eleven?

300

What has cities with no houses, forests with no trees, and rivers with no fish?

What is a map?

300

What is full of holes but still holds water?

What is a sponge?

400

A circular pizza has a radius of 10cm. You double its radius. Name the factor that the area increases by.

What is 4?

400

The missing numbers in the pattern:1, 8, 27, 64, 125, __, __

What is 216 & 343?

400

The day before two days after the day before tomorrow is Saturday. What day is it today?

What is Friday?

(The “day before tomorrow” is today; “the day before two days after” is really one day after. So if “one day after today is Saturday,” then it must be Friday.)

400

What has to be broken before you can use it?

What is an egg?

400

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

What is a pencil lead?
500

Solve the equation for x: x^2-7x+7=-5

What are x=3 and x=4?

500

The missing numbers in the pattern:11, __, 47, 95, __, 383

What is 23 & 191?

500

Brother and sister, Tom and Mary, come from a large family. Tom has as many brothers as he has sisters. Mary has twice as many brothers as sisters. How many boys and girls are in the family?

What is 4 boys and 3 girls?

500

The more of them you take, the more you leave behind. What are they?

What are footsteps?

500

A man calls his dog from across a river, and the dog crosses without getting wet, a bridge, or a boat. How?

The river was frozen.

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